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Class Information
Number: 33/491
Name: Geometrical instruments > Straightedge type > Rules > With attachment > Selectable
Description: Subject matter wherein the straightedge is constructed to provide a choice of ruling edges.

Patents under this class:

Patent Number Title Of Patent Date Issued
8438744 Ruler and method of use May. 14, 2013
7415772 Rainbow ruler Aug. 26, 2008
6813841 Measuring device for teaching incremental measurements Nov. 9, 2004
6816805 Computer generated scale and conversion instrument Nov. 9, 2004
6243959 Measuring and instructional ruler Jun. 12, 2001
5881469 Measuring and instructional ruler Mar. 16, 1999
5822875 Scanning electron microscopic ruler and method Oct. 20, 1998
5479719 Rolling ruler Jan. 2, 1996
4839833 Programmable display engineering scale Jun. 13, 1989
4707928 Vari-scale Nov. 24, 1987

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